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boot.go
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boot.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// boot is the boot code for the Python SDK harness container. It is responsible
// for retrieving and install staged files and invoking python correctly.
package main
import (
"bufio"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/apache/beam/sdks/v2/go/pkg/beam/core/runtime/xlangx/expansionx"
"github.com/apache/beam/sdks/v2/go/pkg/beam/util/execx"
)
var (
id = flag.String("id", "", "Local identifier (required)")
port = flag.Int("port", 0, "Port for the expansion service (required)")
requirements_file = flag.String("requirements_file", "", "A requirement file with extra packages to be made available to the transforms being expanded. Path should be relative to the 'dependencies_dir'")
dependencies_dir = flag.String("dependencies_dir", "", "A directory that stores locally available extra packages.")
)
const (
expansionServiceEntrypoint = "apache_beam.runners.portability.expansion_service_main"
venvDirectory = "beam_venv" // This should match the venv directory name used in the Dockerfile.
)
func main() {
flag.Parse()
if *id == "" {
log.Fatalf("The flag 'id' was not specified")
}
if *port == 0 {
log.Fatalf("The flag 'port' was not specified")
}
if err := launchExpansionServiceProcess(); err != nil {
log.Fatal(err)
}
}
func getLines(fileNameToRead string) ([]string, error) {
fileToRead, err := os.Open(fileNameToRead)
if err != nil {
return nil, err
}
defer fileToRead.Close()
sc := bufio.NewScanner(fileToRead)
lines := make([]string, 0)
// Read through 'tokens' until an EOF is encountered.
for sc.Scan() {
lines = append(lines, sc.Text())
}
if err := sc.Err(); err != nil {
return nil, err
}
return lines, nil
}
func installExtraPackages(requirementsFile string) error {
extraPackages, err := getLines(requirementsFile)
if err != nil {
return err
}
for _, extraPackage := range extraPackages {
log.Printf("Installing extra package %v", extraPackage)
// We expect 'pip' command in virtual env to be already available at the top of the PATH.
args := []string{"install", extraPackage}
if err := execx.Execute("pip", args...); err != nil {
return fmt.Errorf("Could not install the package %s: %s", extraPackage, err)
}
}
return nil
}
func getUpdatedRequirementsFile(oldDependenciesRequirementsFile string, dependenciesDir string) (string, error) {
oldExtraPackages, err := getLines(oldDependenciesRequirementsFile)
if err != nil {
return "", err
}
var updatedExtraPackages = make([]string, 0)
for _, extraPackage := range oldExtraPackages {
// TODO update
potentialLocalFilePath := filepath.Join(dependenciesDir, extraPackage)
_, err := os.Stat(potentialLocalFilePath)
if err == nil {
// Package exists locally so using that.
extraPackage = potentialLocalFilePath
log.Printf("Using locally available extra package %v", extraPackage)
}
updatedExtraPackages = append(updatedExtraPackages, extraPackage)
}
updatedRequirementsFile, err := ioutil.TempFile("/opt/apache/beam", "requirements*.txt")
if err != nil {
return "", err
}
updatedRequirementsFileName := updatedRequirementsFile.Name()
datawriter := bufio.NewWriter(updatedRequirementsFile)
for _, extraPackage := range updatedExtraPackages {
_, _ = datawriter.WriteString(extraPackage + "\n")
}
datawriter.Flush()
updatedRequirementsFile.Close()
return updatedRequirementsFileName, nil
}
func launchExpansionServiceProcess() error {
pythonVersion, err := expansionx.GetPythonVersion()
if err != nil {
return err
}
log.Printf("Starting Python expansion service ...")
dir := filepath.Join("/opt/apache/beam", venvDirectory)
os.Setenv("VIRTUAL_ENV", dir)
os.Setenv("PATH", strings.Join([]string{filepath.Join(dir, "bin"), os.Getenv("PATH")}, ":"))
args := []string{"-m", expansionServiceEntrypoint, "-p", strconv.Itoa(*port), "--fully_qualified_name_glob", "*"}
// Requirements file with dependencies to install.
// Note that we have to look for the requirements file in the dependencies
// volume here not the requirements file at the top level. Latter provides
// Beam dependencies.
dependencies_requirements_file := filepath.Join(*dependencies_dir, *requirements_file)
dependencies_requirements_file_exists := false
if _, err := os.Stat(dependencies_requirements_file); err == nil {
dependencies_requirements_file_exists = true
}
// We only try to install dependencies, if the requirements file exists.
if dependencies_requirements_file_exists {
log.Printf("Received the requirements file %s with extra packages.", dependencies_requirements_file)
updatedRequirementsFileName, err := getUpdatedRequirementsFile(dependencies_requirements_file, *dependencies_dir)
if err != nil {
return err
}
defer os.Remove(updatedRequirementsFileName)
log.Printf("Updated requirements file is %v", updatedRequirementsFileName)
// Provide the requirements file to the expansion service so that packages get staged by runners.
args = append(args, "--requirements_file", updatedRequirementsFileName)
// Install packages locally so that they can be used by the expansion service during transform
// expansion if needed.
err = installExtraPackages(updatedRequirementsFileName)
if err != nil {
return err
}
} else {
log.Printf("Requirements file %s was provided but not available.", dependencies_requirements_file)
}
if err := execx.Execute(pythonVersion, args...); err != nil {
return fmt.Errorf("could not start the expansion service: %s", err)
}
return nil
}